SendToClient not working for UNIT3D/F3NIX sites

Hi,

SendToClient hasn't been working for UNIT3D/F3NIX sites for a while now.
It errors out with the following:
`Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'href')`

I've reproduced this with the latest version on both FF and Chrome, with both Tampermonkey and ViolentMonkey.
It's working fine on Gazelle sites.

Thanks.